Knife sharpener machine



March 30, 1937. M. HANDELMAN KNIFE SHARPENER MACHINE Filed Oct. 24, 1936 INVENTOR Mair/519:5 delmarz BY ATTORNEY Patented Mar. 30, 1937 UNITED STATES PATENT OFFICE A 2,07 5,608 KNIFE SHARPENER MACHINE Morris Handelman, Brooklyn, N. Y.

Application I 4. Claims.

7 This invention relates to new and useful improvements in. a knife or the like sharpener machine. 1

The invention has for an object the construction of a knife sharpener machine which is characterized by a pair of grindstone wheels driven in opposite directions and adapted to be adjusted to various distances from each other, or to be substantially in contact with each other, under adjusted resilient pressures.

Still further the invention contemplates arranging the grindstone wheels, so that they rotate in a common plane and it ispossible to engage a knife between the contacting portions thereof. I

Another one of the objects of this invention is to so arrange the grindstone wheels that they operate at right angles to each other.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawing, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawing forming a material part of this disclosure:-

Fig. 1 is a plan view of a knife sharpener machine constructed according to this invention.

Fig. 2 is a sectionalview taken on the line 2-2 of Fig. 1.

Cir

Fig. 3 is a sectional View taken on the line 3-3 of Fig. 1.

Fig. 4 is a plan view of a knife sharpener ma-' chine constructed according to another modification of this invention.

The knife sharpener machine comprises a base Ill upon which a shaft H is rotatively supported; This shaft carries a grindstone wheel I2 and is associated with a driving means including theelectric motor I3. A second shaft l4 supports a second grindstone wheel coopcrating with the first grindstone wheel l2 for sharpening knives and other implements. This second shaft I4 is rotatively and adjustably mounted on the base l0 and is associated with a means by which it may be held in various positions for changing the operative relation of said grindstone wheels. This second shaft is associated with a driving means including a flexible or adjustable coupling "5 to operate in all adjusted positions of the second shaft.

The base Ill comprises a substantially flat and relatively thin member. The shaft II is rotatively supported in a pair of standards I! 55 spaced from each other and fixedly mounted on October 24, 1936, Serial No. 107,437

the base H). A small pulley I8 is mounted on the shaft H and connects with a belt H) which engages over a small pulley mounted on the shaft of the electric motor l3. These pulleys and the belt comprise the driving means for the 5 shaft II. The second shaft 14 is rotatively sup ported in a pair of bearings 22 which are spaced from each other and which are slidably mounted in grooves 23 formed in the top surface of the base I. These grooves are disposed at right 10 angles to the shaft ll. Each of the bearings 22' are formed with dove tailed feet portion 22 which engage the grooves 23 which are of corresponding shapes. The grindstone wheels I2 and I5 are arranged substantiallyin a common plane 15 so that a knife, may be drawn between them for sharpening.

The bearings 22 are provided with bolts or pins 24 which extend through slots 25 in the bases of the grooves 23 to the underside of the base In. 20 These pins hold a plate element 26 slightly spaced beneath the lower face of the base [0. This plate 26 is provided with a pair of forward projecting fingers 2B between which 'a rod 21 is mounted. This rod 21 engages against a cam 28 which is fixed on a spindle 29 passing through the base II]. A gear 30 is fixed on the top of the spindle 29 and meshes with a pinion 3i rotatively supported in the top face of the base it.

A knob 32 is fixed upon the top pinion 3| by which the pinion may be manually turned. A pair of springs 33 are housed within the grooves 23 and act between the free ends of the grooves and the bearings 22 for urging the bearings in a direction so that the grindstone wheel I5 is urged against the grindstone wheel l2. The knob 32 may be turned for indirectly turning the cam 28 and indirectly moving the plate 26 to adjust the pressures between the grindstone wheels l2 and IE, or their distances. Furthermore, the springs 33 resiliently hold the bearings 22 so that under load they may move to space apart the grindstone wheels l5 and I2.

A means is provided for driving the second shaft I4 and consists essentially of a bevel gear 35 fixed on the shaft 14 and meshing with a bevel gear 33 fixed on a shaft element Hi This shaft element Ili is rotative in a bearing 31 which is supported by pins or bolts 38 passing through slots 39 in the base l0. These pins or bolts 38 connect with the plate 26. The shaft section lfi is formed with a square or similar shaped opening into which there slidably engages a shaft section W. This latter section is rotative in a bearing 39 fixedly mounted on the base ID. A bevel gear 40 is mounted on the shaft section l6 and meshes with a bevel gear 4| mounted on a stud shaft 42 rotative in a bearing 43 fixedly mounted on the base ID. A 5 spring I6 is placed Within the opening in shaft section for the purpose of keeping bevel gears 40 and 4| in mesh. The stud shaft 42 carries a spur gear 44 meshing with a spur gear 45 fixed on the shaft of the motor [3. 10 The operation of the device is as follows:-

Rotations from vthe motor 13 will be transmitted to simultaneously indirectly drive the shafts H and I4 in opposite directions. shaft II is driven by the belt l9 which is con 15 nected with the motor I3. The shaft I4 is driven by the bevel gears 35 and 36 and the transmission system terminating in the gears 44 and 45 the latter gear being connected directly with themotor l3.

The springs33 urge the bearings 22 towards the shaft H and so resiliently urge the grindstone wheel I5 against the grindstone wheel I2. The bearings 22 are held against the action of the springs 33 by reason of the fact that they 5 are directly mounted on the plate 26 which in turn is provided with a bar 21 engaging a cam 28. This cam 28 is adjustable indirectly by the knob 32. Thus, the knob may be turned to ro- 30 tate the cam and force the plate 26 to different adjusted positions against the action of the springs 33. The flexible or adjustable coupling l6, consisting of the inter-engaging shaft sections [6 and I6 permit the shaft [4 to be 35 driven in all of its adjusted positions.

In Fig. 4 a modified form of the invention has been disclosed which is' very similar. to; the

p or f rm, ce t r -theia hat.,t e" ri id stone. Wh els nd," l are a n ed, t ri I angles; to each other; liThis j is accomplished by reason Of-the grindstone wheel 121 being mounted,

onalshaftj l le whichfis rbtativejf irlfa; beafri gj;

I'IEKQI. hart action mgis .atfrightflan'gles the'shaft 1'4;- "Furthermore, this shaft. sections 4E H is provided with 1a; bevel gear '46 meshing; withja bevel gear lli'on' a shaft l lb'rotative in' a be'arin'gtlflb; ,This', shaft ll is provided with the, pulley l8 dnveniby the belt I a, The sn nz I4 is supported andrdriven in'thejidenticalimang her and by theiidenticalflpartsmused in thefprevious form: bf, the, invention," thesesparts" being, recognizable by thesam'e reference numeralsffi .l Whilei Ifhave illustrated and described, the pre ferred embodiments, d imy invent on, [it s we iindeftbdd a ilddi e l m g is towni ci e t cti n i erei adi o esedrand t ri htis ese ved. to :1a 1 ha s and; mo 7 tions'icoming Within; the; scope ofwthe invention as defined'in theappcnded claims:-;

6i) Having thus described my, invention; what/{I claim as new; andfj'desire" to' secure. by" United-L l. A knife sharpener machine comprising base;-'a' shaft supporting a'rgrindston'eand :rota- "tive1y mounted 'onsaid base, 'rneans for driving 41 said Ish'aft, a second shaft supporting a second" grindstone c'ooperativ'ewith said first grindstone for sharpening knives? and other implements}- said' second shaft being rotatively'and adjust? "ably'mounted onsaid "basegmeans for holding said second shaft-in various positions for chang ing 'the cooperative relation of saidrgrindstones," and meansfor driving said. second shaft flexible to operate in all adjusted "positions. o'f'said" se'c- 0nd 5 shaftf 'said mea'ns'ior driving said shaft comprising a motor mounted on said base and a driving mechanism between said motor and shaft, said means for driving the second shaft comprising a driving mechanism connected with said motor and with said second shaft. 5

2. A knife sharpener machine comprising a base, a shaft supporting a grindstone and rotatively mounted on said base, means for driving said shaft, a second shaft supporting a second grindstone cooperative with saidtfirst grindstone 10 for sharpening knives and other implements, said second shaft being rotatively and adjustably mounted on said base, means for holding said second shaft in various positions for changing the cooperative relation of said grindstones, 15 and meansfordriving said second shaft flexible to operate in all adjusted positions of said second shaft,'said means for holding the second shaft adjustedcomprising pins or bolts mounted upon bearings supporting the second shaft and extending through slotsin saidbase, a plate beneathsaid base mounted on said pinsor bolts, said plate being provided with arpair of projecting fingers, a rod mounted between said fingers, a cam engaging againstsaid rod, means for holding said cam in various adjusted posi-- tions, and resilient means for urging said bearings to force said second shaft towards said first shaft.

3. In a knife sharpener machine, a base, a grindstone rotatively supported on said base, an adjustable grindstone rotatively supported on said base and engageable cooperative with said grindstone, and means for driving said grindstone in opposite direction said adjustable m un in om i n a ta r o ativ y u porting a shafton which said 'adjustablegrindi stone is mounted, depending pinsfon lsaid standard engageable throughslotsj'in said'bas'eja plate m t-ed b neath a iba e ensig said; pin; baro ijggedlyfi mounted" on; said plate a res'ilit'zn'tl me s fo'r ur i 'saidis indstone,together; "and"? Ham lementlirb ativel mounted'thmugh'i a d base and? engaging drodisio' that'whe'ri said cam"'is*turn'edit'1no s;saidpla'teI'tddraW said adjustablegrindstone away from said. grindstone against'the normal actionbfisaid resilient means,

14; In" a knife sharpen erl machine, @ja' base,v a

said oam is turnedit m'ovesfsaid plate to d idjadius bl n t away omlsaid 'rm, stfqne ae inst'then ir aI miofisai re ent ni'ea'ns, "saidfresilient means; lcomp'rising'" afdov tailed; foot" portion (in said standard, engages I iri aboacting slot, in said base, 'andan extension, w

spring withins'aid' slot andactin'g betwee'n thefi end oflsaid slotfandosaid foot portion pus said adjustable 1 grindstone, 1 a ainst; said,

stone,- 

